US Patent No. 10,655,286

SYSTEM FOR ANTICIPATING A KICK-BACK EVENT DURING OPERATION OF MILLING MACHINE


Patent No. 10,655,286
Issue Date May 19, 2020
Title System For Anticipating A Kick-back Event During Operation Of Milling Machine
Inventorship Todd Avans, Soddy Daisy, TN (US)
James H. Bevill, Lookout Mountain, GA (US)
David Swearingen, Ooltewah, TN (US)
Assignee Roadtec, Inc., Chattanooga, TN (US)

Claim of US Patent No. 10,655,286

1. A milling machine for milling a roadway surface, said milling machine having a milling machine weight and further comprising:(a) a frame;
(b) a milling assembly comprising:
(i) a drum housing that is attached to the frame;
(ii) a milling drum that is mounted within the milling drum housing and adapted for rotation about a substantially horizontal axis;
(iii) a primary drum drive assembly that is operatively attached to the milling drum and adapted to rotate the milling drum;
(c) a ground-engaging drive assembly that is adapted to drive the milling machine along the roadway surface;
(d) a lifting column that is attached at its upper end to the frame and at its lower end to the ground-engaging drive assembly, said lifting column including:
(i) an outer leg tube which is fixed to the frame and which has a top bracket with an upper surface;
(ii) a linear actuator which can be operated to raise and lower the frame of the machine with respect to the roadway surface;
(e) a load cell sensor that is:
(i) mounted to a bracket on the upper surface of the top bracket of the outer leg tube of the lifting column in such a manner that the load cell sensor is spaced away from the upper surface of the top bracket of the outer leg tube and does not rotate or otherwise move with respect to the frame as the lifting column or the ground-engaging drive assembly is operated;
(ii) adapted to determine if the lifting column is not supporting at least a predetermined portion of the weight of the milling machine;
(iii) adapted to generate a signal indicating that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine;
(f) a controller that is:
(i) operatively attached to the primary drum drive assembly;
(ii) adapted to control the primary drum drive assembly in order to stop the rotation of the milling drum;
(iii) operatively attached to the load cell sensor;
(iv) adapted to receive the signal indicating that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine;
(v) adapted to stop the rotation of the milling drum when the signal received from the sensor indicates that the lifting column is not supporting at least the predetermined portion of the weight of the milling machine.